Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: happstack-yui (user goal)
rejecting: happstack-yui-7373.5.3, 7373.5.2, 7372.5.1, 7371.5.0, 7360.4.1,
7351.4.1, 7351.4.0, 7351.3.0, 7351.2.0 (global constraint requires ==7351.1.0)
trying: happstack-yui-7351.1.0
next goal: base (dependency of happstack-yui-7351.1.0)
rejecting: base-4.7.0.1/installed-e4b... (conflict: happstack-yui => base>=4.3
&& <4.6)
rejecting: base-4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0, 4.5.1.0,
4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1, 4.2.0.0,
4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires installed
instance)
Dependency tree exhaustively searched.